An Etymological Dictionary of Astronomy and Astrophysics

An → ESA spacecraft that was launched on December 3, 2015 to test technologies needed for the Evolved Laser Interferometer Space Antenna (eLISA), an ESA → gravitational wave observatory planned to be launched in 2034. LISA Pathfinder paves the way for future missions by testing in flight the very concept of gravitational wave detection.

See also: LISA, short for → Laser Interferometer Space Antenna; → pathfinder.